Oscar Larrauri denied his first car race in the Argentine Formula 3 championship in 1979. Beginning of the 1980s, he came to Europe and again drove Formula 3 race. With seven individual victories in the European Formula 3 Championship, he secured in 1982 with the Italian team Racing Euro title. There was an unsuccessful year in the Formula 2 European Championship, where he went to the start for Minardi. The career faltered and received only by the Swiss Walter Brun new impetus, who received the Argentines in his sports car team. Until the early 1990s, he drove many sports car racing with the Porsche 962. The highlight was the victory in the Group C race at Jerez in 1986 and the second place overall in the 24- hour race at Le Mans in the same year.
As Brun extended its activities to the formula 1, Larrauri came with EuroBrun racing in this race series. The company ran into a fiasco, Larrauri was able to qualify in two years for only seven world championship races and remained as the team any points.
After his Formula 1 involvement, he returned to the sport and touring cars. On a Ferrari 348 and a F40 he drove in the Japanese GT Championship.
1996, after a year in the Italian Touring Car Championship, he returned to Argentina and secured there in 1997 and 1998 on a BMW 320i the title in the national production car championship.